Audi is testing its forthcoming R8 Spyder, and the car is wearing what appears to be a completely stowable roof, not the targa-style top that has been suggested as a possibility. Yet disappearing along with the roof could also be your view of the engine. The droptop in the spy photos and in Audi's official sketch features a solid engine cover and two curious structures adorned with gills that run up to the rear window. They could line up with an interior element when the roof is down, but it wou